Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86de8fad8848bcb…

MALICIOUS

PDF

72.2 KB Created: 2021-01-23 01:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 169aaaaa14722cc3e70b9d20b63772e1 SHA-1: d73c5429576bd5627c9d132c4548cc6c831dcf7a SHA-256: d86de8fad8848bcbb56939c7eba9f116e90f4fde3b0dfb51f3e76594b66d13ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/123?utm_term=4.nbt.1+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473322/normal_5fde687ba3847.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/XheKjc8/zeviloxekeluxaked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff55b6f044c1.pdfIn PDF document text
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/vapidokeku_bijade_fafudenus_jawijalidov.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/72121221135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5fcbf3654c748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5fcef8fc85d94.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/gd6idTW/62287715644.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/VhahbzK/text_message_marketing_software.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/d320006a778f5ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5fcd67b9ee130.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/fha2Sjj/93513809099.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/9262032.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netifikapiwi.epizy.com/psd_templates_for_photographers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/fukekaruxafetiwepi.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/android_adb_drivers_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/existentialism_feminism_and_simone_de_beauvoir.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 5260 bytes
SHA-256: a2b27c86ac8e630da0ed7717194bb0a1298b67e7baf39430412f6780a56bf243
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 11132 bytes
SHA-256: d0bc103de748d3fe1cd1f71e1254b15dfdba62f0b2bc0fc5c4ef5bfab78b0368

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